My mum joined a few months back, and it's all we hear about!!!!!

She LOVES it. She goes six mornings each week and the staff keep her motivated. They get her off the machines and make her do different things and then put her back on the machines. They recognise she has a bad back, and don't push her on machines that she says cause her back pain. I'm not sure about the pricing of it though, but if you ask mum, she'll tell you it's an excellent investment She's away for a month at the moment, and they were happy to suspend her membership while she's away (so she gets 13 months instead of 12).

I think I'm going to give it a shot, but not until baby #2. I don't want to commit for a year and then find out I can't continue.

ETA - Mum's going more for strength rather than weight loss, but there are different things she does to what weight loss people do, from what I understand.